Who can tell me why?

I get some Excepiton in my applet here:
Exception occurred during event dispatching:
java.lang.IllegalArgumentException: Width (800) and height (0) must be > 0
     at java.awt.image.SampleModel.<init>(SampleModel.java:105)
     at java.awt.image.SinglePixelPackedSampleModel.<init>(SinglePixelPackedSampleModel.java:125)
     at java.awt.image.Raster.createPackedRaster(Raster.java:656)
     at java.awt.image.Raster.createPackedRaster(Raster.java:431)
     at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:909)
     at sun.awt.windows.WComponentPeer.createImage(WComponentPeer.java:330)
     at java.awt.Component.createImage(Component.java:2283)
     at java.awt.Component.createImage(Component.java:2280)
     at com.drivejava.pao.BackingStore.createBuffers(BackingStore.java:85)
     at com.drivejava.pao.BackingStore.componentResized(BackingStore.java:46)
     at java.awt.AWTEventMulticaster.componentResized(AWTEventMulticaster.java:100)
     at java.awt.Component.processComponentEvent(Component.java:3600)
     at java.awt.Component.processEvent(Component.java:3558)
     at java.awt.Container.processEvent(Container.java:1167)
     at java.awt.Component.dispatchEventImpl(Component.java:2595)
     at java.awt.Container.dispatchEventImpl(Container.java:1216)
     at java.awt.Component.dispatchEvent(Component.java:2499)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:336)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:134)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:101)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:96)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:88)
thanks in advance.

you tried to set your height variable to 0, and it's got to be something greater than 0

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